I usually loctite the stud in, but doesn't the nut have a lockwasher?
I reckon those tab washers are worse than useless. Loctite works better, with no tab washer.
I also put a small amount of blue Loctite between the rotor and the crank.I don't get too serious, but at least wipe the oil off first. You'll get it off with a puller, without much trouble, next time. It's better than having it come loose and rattle around.